I use Bing for image searches a lot when I'm looking for DVD artwork- only because the image search on Google is so hard to use atm. Maybe I'm doing it wrong, but search for images on Google tends to go away and not come back for a while, while image searching on Bing is pretty quick.

Before the Google change I think I preferred Bing even then for image searches, but only slightly and not enough to change my habits to default to it instead of Google.